Electrically operated metal pump



May 1.2, 19310 H. A. w. WOOD ELECTRICALLY OPERATED METAL PUMP Original Filed Dec. -18. 1926 s Sheets-Shet 1 May 12, 3931. H. A. w. WQOD ELECTRICALLY OPERATED METAL PUMP Original Filed Dec 18, 1926 3 Sheets-Sheet 2 (Poll;

May 12, 1931. H. A. w. WOOD 1,805,272

ELECTRICALLY OPERATED METAL PUMP Original Filed Dec. 18, 1926 3 Sheets-Sheet 3 lll Q ill w" a l a-tented has HENRY .a WISE WGQD OF NEW YORK,

assrenoe ro woon t awl/semen QHnL lIil-RY CQBEQBATEON, OF NEW YORK, .hl. Y A, COP/PGRATIQN @E WRGEQLQ;

assessments onnrtarian This invention relates a pump for molten metal particularly adapted for filling molds for casting stereotype printing plates. f-leretofore the pumping of the molten metal was done by a hand lever and it required the lifting of a weight of metal equal to the weight of the cast plate and its tail, together with a surplus for safety. This metal was lifted to a considerable height by a single stroke of the handle. -'lhis invention is designed to avoid the necessity of lifting such a weight of metal by hand for each cast.

The principal objects of this invention are to provide power operated means for accomplishing the heavy work of liftin the metal and to provide a single control or starting the electric motor which is used and providin for the proper operation of the pump, and 'automaticmeans for stopping the 1 motor at the rig; ttima More specifically,

the invention involves means whereby a sinle movement of the control handle in one direction starts the motor and closes the by-v pass in the pump; so that the metal will fiow into the mold and means whereby, when the control handle is reversed, the by-pass is first opened, permitting the excess metal to return to the pot without stopping the pump and the motor will continue to run until the main shaft has made complete revolution at which point the power is shut off auto= maticallyo Qther objects and advantages of the inven tion appear hereinafter.

ticn.

Reference is to he had to the accompanying drawings in which big, 1 is a plan ot a pump constructed in accordance wlth this invention;

2 is a sectional view of the pump proper on the line 22 of Fig. 1, showing the parts above in elevation;

Fig. Sis a side elevation looking in the direction of the arrow 3 in Fig. 1 with the loypass of the 5pm shown in section; and

ig. 4% is a gmentary view similar to broken away and showing the switch closed and the parts in opera- In the form shown in the drawings, the furnace cadng l is used as usual to support filed December 18, 1926, Serial 160. 155,632 'l'tenewed :lpril l5 Filth the melting pot 2 in which is located the pump casing or harrelli. The pump casing is supported on an integrally cast bracket carried on the top of the furnace @n this bracket also is carried an lectric motor 5 which by means of achain 6 and sprocket wheels transmits the power to a shaft 7 at a reduced speed. This shaft is shown horizontally located and carried on the bracket 4 and is provided with a worm 8 meshing with a worm wheel 9 on a transverse shaft 10, On the worm wheel is a stud ll located eccentrically and operating a link l2. This link is connected by a stud 13 with a piston rod 14: which slides in hearings 15 and lb. U11 the piston rod is a piston 1? working in the pump barrel 3 which, when lifted, forces the charge of metal up the spout 18 and into the mold, 7

On the sprocket wheel 5) is a hub provided with a depression 2%. On a horizontal shaft 21 is loosely pivoted an arm 22 having a roller 23 rolling on the surface of the hub. When this hub turns around to a position for the depression 20 to receive the roller 28, this arm is free to fall back into the position shown in Fig. 3., Fixed on this shaft 21 is another arm 25 which at the end carries a rod 26 operating the by-pass valve 2'2. This lowers the by-pass valve so that the metal raised by the piston 1'? will flow into the pot directly without ever going into the spout l8. lit will be seen therefore that the pump can operate through a part of a stroke without delivering any metal Fixed on the arm 22 is a rojection 2242 provided with a rod 27a whic is connected till i'll

with a switch 28 to open and close it in accordance with the position of the arm 22 and as shown in Figs. 3 and s. It will be seen A spring 29 is free on the shaft 21 but one end is held in one of the bearings 24 and the other in the arm 22. The spring is coiled so as to hold this arm inwardly so that the roller will roll on the surface of the hub of the gear 9. The in or stud 31 is carried by the arm 22 and the, arm 30 is fixed on the shaft 21. The spring 29 holds the arm 22 against the hub cam at all times so that the roller will always fall into the notch or depression 20 when it comes around.

In the operation of the device, assuming the parts to be at rest as shown in Figs. 1, 2 and 3 the operator turns the handle 28a to move the rod 21 back to the position shown in Fig. 4 and positively swings the arm 30, which through the stud 31, draws the arm 22 back positively and closes the switch. This starts the motor and also raises the rod 26 to close the valve 27 so that the pump is put into operative position. The rotation of the parts by the motor causes the link 12 of course, to move around from the position shown in Fig. 3 to the same position again. giving one full stroke to the pump piston and filling the mold. It will be noted that the movement of the handle 28a in this direction positively operates the shaft 21 but, when the handle 28a is turned back to the original position, it opens the bypass valve 27 but it does not disengage the switch 28. It merely permits the spring 29 to perform that iunction, whenever the cam rotates around to bring the notch 20 into registration with the roller 23. Therefore the pump continues throughout its full stroke, although the by-pass is opened. The breaking of the current feeding the motor of course is not accomplished until the worm wheel 9 .is rotated around again to the original position shown in Fig. 3 which'completes its rotation. This causes the roller 23 to fall into the notch 20 which is the cam that opens the switch and stops the motor. The operator can turn the handle 28a back when the mold is filled and leave the machine to continue its operation and come to a stop.

It will be seen therefore that the heavy work of lifting metal is accomplished by power and yet the operator has full control of the time of starting the motor and also the time of stopping the effective operation of the pump, but he does not stop by hand the motion of the piston. That is stopped automatically with the piston down in the position shown in Fig. 2 and with the parts in the proper position for starting again'to perform a complete operation' Although I have illustrated and described only a single form of the invention I am aware of the fact that modificationscan be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims.

Therefore. I do not wish to be limiteyd to all the details of construction herein shown and described, but what I do claim is 1. In astereotype plate metal pump, the combination with the pump, its piston and a by pass valve which, when opened, prelvents the pump from forcing metal up the spout thereof, of power operated means for lifting the piston to discharge metal, of a switch for controlling said power operated means, hand-operated means for closing sald switch and o ening the byass, and automatic means ibr thereafter t rowing oil the power when the piston has made a complete stroke in both directions.

2. In a mold filling pump, the combination with a pump barrel and its piston, of an electric motor, means connected with the electric motor for reciprocating the piston, a shaft having a handle r'or controlling the machine, a switch for controlling the supply of power to the motor, means tending to open the switch, and means operated by the piston reciprocating means to hold the switch closed until the pump piston has made: a complete reciprocation. z 1

3. In a mold fillingpump, the combination with a pump barrel and its piston, of an electric motor, means connected with the electric motor for reciprocating the piston, a shaft having a handle for controlling the machine, means on the shaft for controlling the operativeness of the pump at the will of the open ator, a pivoted arm, a spring for normally forcing the arm in one direction, a switch for controlling the suppl of power to the motor, means on sai arm tending to open the switch when the spring is allowed to act, and means operated by the piston reciprocating means for keeping the arm in a position to hold the switch closed until the pump piston has made a complete reciprocation.

4. In a mold filling pump, the combination with a pump barrel and its piston, of a motor, a wheel connected with the motor to be rotated thereby, connections between the wheel and the pump piston for reci rocatin the piston once for each rotation of t e whee a switch for sup lying the motor with power, means connects with said wheel for holdin said switch closed throughout a rotation o the wheel and then allowingiit to be opened at the end of the rotation w en the piston is down, and springressed means for opening the switch when al owed to do so.

5. In a pump for filling molds with molten metal, the com ination with the pump barrel, a piston therein, and a by-pass having a valve which, when opened, permits the metal to flow out of the barrel without entering the mold, of a control shaft adapted to be turned to two positions, means fixed on the control shaft for-closing the by-pass valve, an electric motor, means operated by the motor for reciprocatin the iston of the pum ,a switch for controlling t e operation of t e motor,

and means whereby when the piston has made a complete reciprocation in both directions the switch will be thrown out automatically, irrespective of the position of said handle, whereby the handle can be turned to open the bypass before the motor is stopped.

6. In a mold filling pump, the combination with the pump barrel, its piston, an electric motor'for operating'the piston and a motor switch. of a by-pass valve in the pump barrel. a hand control shaft, means fixed on the sha f t for operating the by-pass valve, a spring coiled on the shaft and fixed at one end, an arm loose on the shaft and connected withithe other end of the spring, said arm being provided with means for opening and closing the motor switch and the spring being set to tend to move the arm in a direction to open the switch, means fixed on the control shaft for holding said arm back against the action of the spring untilthe controlling shaft is turned to allow the switch to be opened.

-7. In a mold filling pump, the combination with the pump barrel, its piston, an electric motor for operating the piston and a motor switch, of a by-p'ass valve in the pump barrel, a hand control shaft, means fixed on the shaft for operating the by-pass valve, a spring coiled on the shaft and fixed at one end, an arm loose on the shaft and connected with the other end of the spring, said arm being provided with means for opening and closing the motor switch and the spring being set to tend to move the arm in a direction to open the switch, means fixed on the control shaft for holding said arm back against the action of the spring until the controlling shaft is turned to allow the switch to be opened, and means operated by the motor for controlling the closing of the switch so that it can be opened only when the pump piston is substantially at the end of its stroke.

8. In a mold filling pump, the combination with the pump barrel, its piston, an electric motor for operating the piston and a motor switch, of a hand control shaft, a spring coiled on the shaft and fixed at one end, an arm loose on the shaft and connected with the other end of the spring, said arm bemg provided with means for opening and closing the motor switch and the spring being set to tend to move the arm in a direction to open the switch, and means operated by the motor for controlling the closing of the switch so that it can'be opened only when the pipmlp piston is substantially at the end of its s ro e.

9. In a pump, the combination with the piston and a by pass valve which, when opened, prevents the pump from forcing metal up the spout thereof, of power operated means for llfting the piston to discharge metal, a swltch for controlling said power operated means, and a hand operated-means for both closmg said switch and opening the by-pass.

10. In a mold filling pump, the combination with a pump barrel and its piston, of means for reciprocating the piston, a switch for controlling the supply of power to the piston reciprocating means, means tending to open the switch, and means operated by the piston reciprocating means to hold the switch closed until the pump piston has made a complete reciprocation.

11. In a pump, the combination with a melting pot, a piston and cylinder, a motor and means by which the motor operates the piston, the cylinder having a by-pass, of a control handle, means wherebya single movement of the control handle in one direction starts the motor and closes the by-pass so that the metal will flow and means whereby, when the control handle is reversed, the bypass is first opened, permitting the excess metal to return to the pot without stopping the pump, and the motor will continue to run until the pump has made a complete cycle of operations at which point the power is shut off automatically.

In testimony whereof I have hereunto affixed my signature.

HENRY A. ISE WOOD. 

